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A set of processes is deadlocked if each process in the set is waiting for an event that only another process in the set can cause (including itself).
Waiting for an event could be:
- waiting for access to a critical section
- waiting for a resource Note that it is usually a non-preemptable (resource). pre-emptable resources can be yanked away and given to another.
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What is safety algorithms in operating system?
safety algorithm is algo which is used for deadlock avoidance.
What are the differences between deadlock avoidance and deadlock prevention in operating systems?
Deadlock Prevention: o Preventing deadlocks by constraining how requests for resources can be made in the system and how they are handled (system design). o The goal is to ensure that at least one of the necessary conditions for deadlock can never hold. * Deadlock Avoidance: o The system dynamically considers every request and decides whether it is safe to grant it at this point, o The system requires additional apriori information regarding the overall potential use of each resource for each process. o Allows more concurrency. Similar to the difference between a traffic light and a police officer directing traffic. * Deadlock deduction:- Often, neither avoidance nor deadlock prevention may be used. Instead deadlock detection and process restart are used by employing an algorithm that tracks resource allocation and process states, and rolls back and restarts one or more of the processes in order to remove the deadlock. Detecting a deadlock that has already occurred is easily possible since the resources that each process has locked and/or currently requested are known to the resource scheduler or OS. Detecting the possibility of a deadlock before it occurs is much more difficult and is, in fact, generally undecidable, because the halting problem can be rephrased as a deadlock scenario. However, in specific environments, using specific means of locking resources, deadlock detection may be decidable. In the general case, it is not possible to distinguish between algorithms that are merely waiting for a very unlikely set of circumstances to occur and algorithms that will never finish because of deadlock. Deadlock detection techniques include, but is not limited to, Model checking. This approach constructs a Finite State-model on which it performs a progress analysis and finds all possible terminal sets in the model. These then each represent a deadlock.
Explain all types of operating system with diagram?
There are basically four types of operating systems. They include Batch Operating System, Multiprogramming Operating System, Network Operating System and Distributed Operating System.
What are 5 Classification of each operating system?
1. BATCH PROCESSING operating system 2. MULTIPROGRAMMING operating system 3. TIME SHARING operating system 4. REAL TIME operating system 5. DISTRIBUTED operating system
What is operating system and what is the uses of operating system?
An operating system manages the working operation of a computer
